These multiple size screwdrivers come in a handy leather wallet case, light and portable, internal type batch head bayonet fixed, not easy to scatter. Professional and utility. Each screwdriver bit fits perfectly onto the handle, and can easily be changed from one to another, so switching from different screws or projects is a breeze. Full set of 24 batch head, can be adapted to work in many different fields. Suitable for most digital products, various types of computer, mobile phone, camera, glasses, watches, car keys, iPad, tablet, PC laptop, RC Quadcopter Drone etc. High precision screwdriver head made from a high-end steel(chrome vanadium steel)by special heat treatment, hardness can reach HRC52-60. The handle made from alloy material manufacturer, the tail adopts the precision bearing design, flexible and easy to use.